Kiln and the like



Aug. 25, 1936. H. KRONSTAD 2,052,233

KILN AND THE LIKE Filed July 2, 1932 3 Sheets-Sheet 1 m .w h 7 m m w u w m n M n R n K Mk W; MK w m M. m H w b v fl H Qk w n I u I u NM n h k m k U HMH Giro 1 M 1 Aug. 25, 1936. H. KRONSYTAD KILN AND THE LIKE Filed July 2, 1932 3 Sheets-Sheet 2 Aug.25, 1936. H KR N TA 2,052,233

KILN AND THE LIKE- Filed July 2, 1932 3 Sheets-Sheet 3 gwucwto'o HHA vn/ao KROMSTAD,

Patented Aug. 25, 1936 UNITED STATES PATENT OFFICE KILN AND THE LIKE V Haavard Kronstad, Mas ury, Ohio Application July 2, 1932, Serial No. 620,646

11 Claims. (Cl. 263- 33) The present invention relates to feeding material to and treating it in kilnsand the like and especially to such: devices as include a rotary cylinder in which material is to be treated together with a possible auxiliary treatment of the material. The character of the material to be introducedi's not essential to the invention.

The usual kiln 6 now employed in commercial and industrial plants for the manufacture of cement consists of a long cylinder which rotates about its axis and which is slightly inclined to the horizontal. The inclination of the cylinder tends to feed the materialrec'eived and treated from the higher end to the lower end, as the cylinderrotates. It lifts material at the bottom of thecylinder and causes it to fall downward and forward. V

In such a oylinderfor the treatment or manufacture of cement a high temperature is maintained with the ultimate purpose in view of calcining and clinkering the materials to make the cement. Ordinarily in order to maintain this high temperature fuel of some sort, such as oil, powdered coal natural gas or the like, is forced througha pipe I or other suitable means into the cylinder at its lower end 8 and the combustion takes" place within the cylinder. The clink-' ered material is discharged 'from'the lower end of the cylinder. a

The feeding devices now in use generally feed the cement-making materials into the upper end of the cylinder. A hopper orithe like is arranged above this upper end and a more or less inclined pipe extends therefrom. downward and into the end of the cylinder. If the moisture of the material is reduced, or if the material is dry, it has a tendency to clog unless it is forced through the pipe by some such means as a screw propeller.

At the end of this pipe the material has a tendency to build up, and part of it may work its way into the dust chamber 9.

The present invention is intended to overcome the objections inherent in the arrangements above described.

Fig. 1 is a side elevation of a kiln and a feeding device showing the present invention.

Fig. 2 is a. longitudinal section taken on center line of kiln.

Fig. 3 is a transverse vertical section on line 2--2, Fig. 2.

Fig. 4 is a similar transverse vertical section on the line I-I, Fig. 2.

Fig. 5 is a longitudinal section taken on center line of kiln.

The kiln consists of a main rotary cylinder 6 which'may be of any suitable dimensions, and

which is carried so that it may rotate upon bearings Ill. A

- Referring to the form disclosed by Figs. 1, 2, 3 and 4, the material enters at the upper end of the kiln, through a spout II. This spout is connected to a stationary cylinder I2 which has a smaller diameter than and extends into the kiln 6. Cylinder I2 may be supported any place on the circumference, indicated at J3. Cylinder I2 at itsupper end extends inside a short cylinder I4, which extends. towards the dust chamber, and prevents the material from falling into the same. Cylinder I4 and kiln 6 are connected together with longitudinal plates, or a suitable casting I5. This connector I5 may be spirally arranged or made with several compartments and its walls serve as lifters, I6 is a seal ring fastened to cylinder I 4. Two cylinders I'I surround and partly enclose cylinder I4 and kiln 6, These cylinders are stationary, connected to cylinder I2 and serve as a support for spout II. Between'kiln 6 and I1 and between cylinder I2 and I?! are angle rings so located and fastened as to form seals as shown. ,Airseal I 8 may be of any desired construction.

Any suitableconveyor I9 delivers the material to the spout I I. It falls by gravity down into the compartments of connector I5. 7 As the connector I5 and cylinder M are connected to kiln 6 they rotate with the kilnon the same axis. As the kiln rotates the material now resting on the connector will be lowered and finallyfall on cylinder I2. Thereit will restuntil next lifter on the connector will carry it upward and forward, towards and into the kiln. To prevent accumulating of material at the end of cylinder I4, spiral strips or angle irons are fastened to the inner surface of the cylinder. forward movement of the material the kiln may also have similar arranged strips or angle irons.

In the form disclosed by Fig. 5, the material enters a stationary cylinder 20 through a spout I I which is connected to the same. This cylinder 20 has a smaller diameter than kiln 6. From the end of the kiln spirally arranged strips or angle To augment the irons 2I extend into the stationary cylinder 2|].

The ends of these strips or angle irons can be supported by an angle ring 22 or by any suitable means. To augment the forward movement of the material these spirally arranged strips may be extended some ways into kiln 6. A cylinder 23 surrounds the overlapping portions at the kiln end. Between kiln 6 and cylinder 23 angle rings are so located and fastened as to form a seal. 24

is an additional support for stationary cylinder 20.

Any suitable conveyor I9 delivers the material into the spout. It falls by gravity into the bottom of the stationary cylinder 20. From here it will be screwed into the kiln by the spirally arranged plows 2|.

I claim as my invention:

1. In combination with a rotary kiln or the like, a rotary extension on the kiln, a connector combining the kiln and the extension, a stationary cylinder inside the kiln and the extension, and surrounding part of the connector, and a spout connected to the cylinder through which the material falls on the connector inside the stationary cylinder.

2. A kiln structure comprising a rotary kiln, a rotary extension thereof connected therewith, a stationary cylinder inside of said kiln and extension, and a feed-spout leading into said cylinder at a place between said kiln and extension.

3. A kiln structure comprising a rotary kiln, a rotary extension thereof spaced therefrom and. connected therewith, a stationary cylinder bridging the space between and extending into said kiln and extension, and a feed-spout leading into said cylinder between said kiln and extension.

4. A kiln structure comprising a rotary kiln, a rotary extension thereof spaced therefrom, a stationary cylinder bridging the space between and extending into said kiln and extension, members inside of said cylinder fixed to and connecting said kiln and extension, and a feed-spout leading into said cylinder between said kiln and extension.

5. The combination, with a rotary kiln, of a stationary cylindrical extension thereof, coaxial throughout therewith, and open at both ends, said extension projecting into said kiln with its outer periphery close to the inner side of said kiln and affording throughout its central portion a free and unobstructed passage for gases from the kiln, and a feed-spout leading into the top of said extension.

6. The combination, with a rotary kiln, of a stationary cylindrical extension thereof, coaxial throughout therewith, and open at both ends, said extension projecting into said kiln with its outer periphery close to the inner side of said kiln and affording throughout its central portion a free and unobstructed passage for gases from the kiln, an annular member surrounding the joint between said extension and kiln, a gas-seal between said member and kiln, and a feed-spout leading into the top of said extension.

'7. The combination, with a rotary kiln, of a stationary cylindrical extension thereof, coaxial throughout therewith, and open at both ends, said extension projecting into said kiln with its outer periphery close to the inner side of said kiln and affording throughout its central portion a free and unobstructed passage for gases from the kiln, an annular member fixed to said extension and surrounding the joint between said extension and kiln, a gas-seal between said member and kiln, and a feed-spout leading into the top of said extension.

8. The combination, with a rotary kiln, of a stationary cylindrical extension thereof, coaxial throughout therewith, and open at both ends, said extension projecting into said kiln with its outer periphery close to the inner side of said kiln and affording throughout its central portion a free and unobstructed passage for gases from the kiln, feed members inside of and connected to said kiln and extending into said extension positioned close to the periphery of the latter, and a feed-spout leading into said extension above said feed members.

9. The combination, with a rotary kiln, of a stationary cylindrical extension thereof of slightly less diameter than and extending into said kiln affording a free and unobstructed passage from end to end therethrough and axially therefrom for gases from the kiln, and a feed-spout leading into the top of said extension.

10. The combination, with a rotary kiln, of a stationary cylindrical extension thereof of slightly less diameter than and extending into said kiln and affording a free and unobstructed passage from end to end therethrough and axially therefrom for gases from the kiln, an annular member surrounding the joint between said extension and kiln, a gas-seal between said member and kiln, and a feed-spout leading into the top of said extension.

11. The combination, with a rotary kiln, of a stationary cylindrical extension thereof of slightly less diameter than and extending into said kiln and affording for gases from the kiln a free and unobstructed passage from end to end through its central portion and axially therefrom, feed members inside of and connected to said kiln and extending into said extension close to the periphery thereof, and a feed-spout leading into said extension above said feed members.

HAAVARD KRONSTAD. 

